Java Writing Classes Unit 5 Quiz

What is a constructor in Java?

• A method used to destroy objects

• A keyword used to declare variables

• A special method used to initialize objects

• A data type used to store values

Which of the following is true about constructors?

• They are used to destroy objects

• They are used to modify objects at runtime

• They are used to initialize objects

• They are used to declare variables

What is the purpose of a destructor in Java?

• To modify the state of an object in Java.

• To create a new object in Java.

• To initialize an object in Java.

• To release resources or perform cleanup tasks associated with an object.

Which keyword is used to create an instance of a class in Java?

• instance

• new

• create

• class

Which of the following is true about accessor methods?

• They are not necessary in object-oriented programming

• They are used to modify the value of an instance variable

• They are only used in static methods

• They are used to retrieve the value of an instance variable

What is the naming convention for a constructor in Java?

• Init

• Same name as the class

• Constructor

• Different name than the class

Which of the following is true about default constructors?

• Default constructors must be defined explicitly in the class.

• Default constructors can only be generated for classes with no attributes.

• Default constructors always have the same signature as the parameterized constructors.

• They are automatically generated by the compiler if no constructor is defined in the class.

What is the purpose of the 'this' keyword in Java?

• To refer to the current object instance and avoid naming conflicts between instance variables and local variables or parameters with the same name.

• To declare a new variable

• To access static variables and methods

• To create a new object instance

Which of the following is true about static methods?

• They belong to a class and can be called without creating an object of the class.

• They can only be called after creating an object of the class.

• They can only be called from within the class.

• They can modify instance variables of the class.

What is the purpose of an accessor method in Java?

• To modify the value of a private variable

• To delete a private variable

• To create a new private variable

• To retrieve the value of a private variable